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This function searches in the list of 2-tuples the one which first element is the same string than the specific _string_ (it performs a 'strcmp' test). It this tuple is found, the function returns the second element of the tuple, else it returns nil.

u0 switchstr ( [[S u0] r1] _list_ S _string_ )

_list_
	list of 2-tuples whose first element is a string
_string_
	string to search in the list